The Magnetic Entropy Changes in Pb Doped Ni-Mn-Cu-Ga Alloys

• Autorzy: Sielicki K. , Zygmuntowicz J. , Wróblewski R. , Leonowicz M.

Identyfikatory

DOI

10.24425/amm.2020.132827

• Języki publikacji: EN

Abstrakty

EN

Effect of Pb addition on magnetocaloric properties of Ni₅₀ Mn_18,75 Cu_6,25-aPb_aGa₂₅ (a = 1, 2, 3, 4, 5) alloys was investigated experimentally. The magnetic measurements conducted at low field of 4 kA/m showed that addition of Pb led to separation of the both transformation temperatures and significantly shifted the structural transition effect towards lower temperatures as well as increased the Curie temperature. The analysis of isothermal magnetic curves allowed for the calculation of magnetic entropychange (ΔS_M). Although the peak values of |ΔS_M| for alloys containing 4 and 5 at.% Pb, ~3 J/(kg*K) and ~1.5 J/(kg*K) respectively, are low they stretch over the structural transformation and Curie temperature, and are at least 30 K wide at half maximum height.

Słowa kluczowe

EN

magnetocaloric effect; magnetic entropy change; Curie temperature; Heusler alloys

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2020
• Tom: Vol. 65, iss. 2
• Strony: 823--825
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wzory

Twórcy

autor

Sielicki K.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, 141 Woloska Str., 02-507warszawa, Poland

autor

Zygmuntowicz J.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, 141 Woloska Str., 02-507warszawa, Poland

autor

Wróblewski R.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, 141 Woloska Str., 02-507warszawa, Poland

autor

Leonowicz M.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, 141 Woloska Str., 02-507warszawa, Poland

Bibliografia

• [1] A. M. Tishin, [in:] Handbook of magnetic materials, Elsevier Science 12, 395, Amesterdam 1999, DOI: 10.1016/S1567-2719(99)12008-0.
• [2] V. K. Pecharsky, K. A. Gschneidner, A. O. Pecharsky, A. M. Tishin, Phys. Rev. B 64, 144406 (2001).
• [3] O. Tegus, E. Brück, Dagula, L. Zhang, K. H. J. Buschow, F. R. de Boer, Physica B 319, 174-192 (2002).
• [4] P. Weiss, A. Piccard, J. Phys. Theor. Appl. 7, 103-109 (1917). DOI: 10.1051/jphystap:01917007001030.
• [5] V. K. Pecharsky, K. A. Gschneidner Jr., Phys. Rev. Lett. 78, 4494 (1997). DOI: 10.1103/PhysRevLett.78.4494.
• [6] R. Wróblewski, K. Sielicki, M. Leonowicz, Inżynieria Materiałowa 31, 284-286 (2010).
• [7] S. Stadler et al., Appl. Phys. Lett. 88, 192511 (2006). DOI: 10.1063/1.2202751.
• [8] K. Sielicki et al., Acta Physica Polonica A 127, 2 644 (2015).
• [9] R. Wróblewski, K. Sielicki, M. Leonowicz, Magnetocaloric properties of the stacked Ni50Mn18.75-xCu6.25+xGa25 (x = 0÷1) polycrystalline alloys, in 7th International Conference on Magnetic Refrigeration at Room Temperature (Thermag VII), IIR (2016). DOI: 10.18462/iir.thermag.2016.0176.

Uwagi

EN

1. The project is co-financed by the National Science Centre (NCN) fund, agreement with NCN nr DEC-2013/09/N/ST8/02017. This investigation supported by the Foundation for Polish Science (FNP) – START scholarship.

PL

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).